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To examine the effects of different wavelengths of ultraviolet (UV) radiation on tumor necrosis factor (TNF) production, we took advantage of mice carrying a chloramphenicol acetyl transferase (CAT) reporter transgene bearing the entire TNF promoter and 3 -untranslated region. Aside from constitutive expression in the thymus, CAT activity was detected only in locally UVB- or UVC-irradiated skin...